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Diffstat (limited to 'trunk/pango/pango-color.c')
| -rw-r--r-- | trunk/pango/pango-color.c | 259 |
1 files changed, 259 insertions, 0 deletions
diff --git a/trunk/pango/pango-color.c b/trunk/pango/pango-color.c new file mode 100644 index 00000000..beae87fa --- /dev/null +++ b/trunk/pango/pango-color.c @@ -0,0 +1,259 @@ +/* pango + * pango-color.c: Color handling + * + * Copyright (C) 2000 Red Hat Software + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Library General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Library General Public License for more details. + * + * You should have received a copy of the GNU Library General Public + * License along with this library; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 02111-1307, USA. + */ + +#include <config.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#include "pango-attributes.h" +#include "pango-impl-utils.h" + +GType +pango_color_get_type (void) +{ + static GType our_type = 0; + + if (G_UNLIKELY (our_type == 0)) + our_type = g_boxed_type_register_static (I_("PangoColor"), + (GBoxedCopyFunc) pango_color_copy, + (GBoxedFreeFunc) pango_color_free); + + return our_type; +} + +/** + * pango_color_copy: + * @src: color to copy + * + * Creates a copy of @src, which should be freed with + * pango_color_free(). Primarily used by language bindings, + * not that useful otherwise (since colors can just be copied + * by assignment in C). + * + * Return value: the newly allocated #PangoColor, which should + * be freed with pango_color_free(). + **/ +PangoColor* +pango_color_copy (const PangoColor *src) +{ + PangoColor *ret; + + g_return_val_if_fail (src != NULL, NULL); + + ret = g_slice_new (PangoColor); + + *ret = *src; + + return ret; +} + +/** + * pango_color_free: + * @color: an allocated #PangoColor + * + * Frees a color allocated by pango_color_copy(). + **/ +void +pango_color_free (PangoColor *color) +{ + g_return_if_fail (color != NULL); + + g_slice_free (PangoColor, color); +} + +/** + * pango_color_to_string: + * @color: a #PangoColor + * + * Returns a textual specification of @color in the hexadecimal form + * <literal>#rrrrggggbbbb</literal>, where <literal>r</literal>, + * <literal>g</literal> and <literal>b</literal> are hex digits representing + * the red, green, and blue components respectively. + * + * Return value: a newly-allocated text string that must be freed with g_free(). + * + * Since: 1.16 + **/ +gchar * +pango_color_to_string (const PangoColor *color) +{ + g_return_val_if_fail (color != NULL, NULL); + + return g_strdup_printf ("#%04x%04x%04x", color->red, color->green, color->blue); +} + +/* Color parsing + */ + +/* The following 2 routines (parse_color, find_color) come from Tk, via the Win32 + * port of GDK. The licensing terms on these (longer than the functions) is: + * + * This software is copyrighted by the Regents of the University of + * California, Sun Microsystems, Inc., and other parties. The following + * terms apply to all files associated with the software unless explicitly + * disclaimed in individual files. + * + * The authors hereby grant permission to use, copy, modify, distribute, + * and license this software and its documentation for any purpose, provided + * that existing copyright notices are retained in all copies and that this + * notice is included verbatim in any distributions. No written agreement, + * license, or royalty fee is required for any of the authorized uses. + * Modifications to this software may be copyrighted by their authors + * and need not follow the licensing terms described here, provided that + * the new terms are clearly indicated on the first page of each file where + * they apply. + * + * IN NO EVENT SHALL THE AUTHORS OR DISTRIBUTORS BE LIABLE TO ANY PARTY + * FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES + * ARISING OUT OF THE USE OF THIS SOFTWARE, ITS DOCUMENTATION, OR ANY + * DERIVATIVES THEREOF, EVEN IF THE AUTHORS HAVE BEEN ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + * THE AUTHORS AND DISTRIBUTORS SPECIFICALLY DISCLAIM ANY WARRANTIES, + * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT. THIS SOFTWARE + * IS PROVIDED ON AN "AS IS" BASIS, AND THE AUTHORS AND DISTRIBUTORS HAVE + * NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR + * MODIFICATIONS. + * + * GOVERNMENT USE: If you are acquiring this software on behalf of the + * U.S. government, the Government shall have only "Restricted Rights" + * in the software and related documentation as defined in the Federal + * Acquisition Regulations (FARs) in Clause 52.227.19 (c) (2). If you + * are acquiring the software on behalf of the Department of Defense, the + * software shall be classified as "Commercial Computer Software" and the + * Government shall have only "Restricted Rights" as defined in Clause + * 252.227-7013 (c) (1) of DFARs. Notwithstanding the foregoing, the + * authors grant the U.S. Government and others acting in its behalf + * permission to use and distribute the software in accordance with the + * terms specified in this license. + */ + +#include "pango-color-table.h" + +static int +compare_xcolor_entries (const void *a, const void *b) +{ + return g_ascii_strcasecmp ((const char *) a, color_names + ((const ColorEntry *) b)->name_offset); +} + +static gboolean +find_color(const char *name, + PangoColor *color) +{ + ColorEntry *found; + + found = bsearch (name, color_entries, G_N_ELEMENTS (color_entries), + sizeof (ColorEntry), + compare_xcolor_entries); + if (found == NULL) + return FALSE; + + if (color) + { + color->red = (found->red * 65535) / 255; + color->green = (found->green * 65535) / 255; + color->blue = (found->blue * 65535) / 255; + } + + return TRUE; +} + +static gboolean +hex (const char *spec, + int len, + unsigned int *c) +{ + const char *end; + *c = 0; + for (end = spec + len; spec != end; spec++) + if (g_ascii_isxdigit (*spec)) + *c = (*c << 4) | g_ascii_xdigit_value (*spec); + else + return FALSE; + return TRUE; +} + +/** + * pango_color_parse: + * @color: a #PangoColor structure in which to store the result + * @spec: a string specifying the new color + * + * Fill in the fields of a color from a string specification. The + * string can either one of a large set of standard names. (Taken + * from the X11 <filename>rgb.txt</filename> file), or it can be a hex value in the + * form '#rgb' '#rrggbb' '#rrrgggbbb' or '#rrrrggggbbbb' where + * 'r', 'g' and 'b' are hex digits of the red, green, and blue + * components of the color, respectively. (White in the four + * forms is '#fff' '#ffffff' '#fffffffff' and '#ffffffffffff') + * + * Return value: %TRUE if parsing of the specifier succeeded, + * otherwise false. + **/ +gboolean +pango_color_parse (PangoColor *color, + const char *spec) +{ + g_return_val_if_fail (spec != NULL, FALSE); + + if (spec[0] == '#') + { + size_t len; + unsigned int r, g, b; + + spec++; + len = strlen (spec); + if (len % 3 || len < 3 || len > 12) + return FALSE; + + len /= 3; + + if (!hex (spec, len, &r) || + !hex (spec + len, len, &g) || + !hex (spec + len * 2, len, &b)) + return FALSE; + + if (color) + { + int bits = len * 4; + r <<= 16 - bits; + g <<= 16 - bits; + b <<= 16 - bits; + while (bits < 16) + { + r |= (r >> bits); + g |= (g >> bits); + b |= (b >> bits); + bits *= 2; + } + color->red = r; + color->green = g; + color->blue = b; + } + } + else + { + if (!find_color (spec, color)) + return FALSE; + } + return TRUE; +} |